So, today I found that one of my dwarves likes trout of Kogut tooth. I'm going to assume that's one of the fish from the fishing pond, since I haven't used it once I determined it took ages to get anything. I'm also going to guess that they don't actually have teeth.
Thank god he's not a noble.
In other news, I got ANOTHER damascus arbiter. And I'm very much inclined to agree with them needing tweaked. I've fought this guy twice (savescum), and here are my results:
Military of 10 legendary miners, all iron armor, 1 iovium pick and 9 irons picks. 1 talented macedwarf, damascus steel mace. 5 marksdwarves, wooden crossbows, iron armor, using forgotten beast bone bolts.
Result set 1:
I charged all my military at him as soon as he appeared. Iron was completely useless against him, so the miners were unable to do anything. Mace was also completely ineffective. The one miner with an iovium pick occasionally got lucky and dented something. He managed to fracture a few spots as well. Interestingly, the forgotten beast bone bolts had the highest rate of effectiveness (which was still about nill), managing a few dents and fractures.
The arbiter himself didn't have much combat effectiveness. He occasionally broke a bone, and did manage to kill a few dwarves by breaking their spines. He also ripped an iron gauntlet away from one dwarf, smashed his brain in with it, and proceeded to wear it.
I sent an untrained axe dwarf into the fight with an iovium battleaxe, as it was the only other edged weapon I had higher than steel, and although I know iovium is supposed to be terrible for anything but blunt, I was ridiculously effective with an iovium spear in an adventure mode run, so I figured it might work. The axe did successfully cause some dents, which was more than most of my weapons, but the arbiter quickly targeted and disabled the dwarf wielding it.
Savescummed as my military began to die from dehydration. Seriously. They fought that thing for so long they used all their supplies (I periodically cancelled the orders for a second to let them eat/drink), and were passing out from exhaustion constantly.
Result set 2:
Knowing my weapons were hopelessly ineffective, I left him alone and ordered my weaponsmith to make some mithril and damascus steel picks, figuring that since those were capable of severing the limbs of most creatures in the hands of a legendary miner (I had a lot), they might work.
Unfortunately he was a lazy ass and decided to sleep, eat, and drink before doing anything, despite micromanaging, so the arbiter started chasing people and I was forced to send out the same military squad as before, with much of the same results, except for a lot more wrestle moves on the arbiter's part (chokeholds).
When he finally managed to do it, half my military was dead or unconscious. I quickly equipped two remaining miners in armor and a mithril and damascus steel pick, respectively, and told them to go fight. Both were legendary, so it definitely wasn't a skill issue.
The result was an endless spam of 'attack glances away'. Unlike the iovium weapons, they didn't even dent anything.
Conclusion:
This thing is fucking
INVULNERABLE. The only weapons that even touch it are iovium and FB bone bolts; everything else just glances away or breaks away some of the gas-emitting stuff (which doesn't show up, but eventually it says the gas-emitting pieces in all the body parts are gone; no apparent effect).
It looks like the only possible way to kill this would be with adamantine weaponry. Mithril and damascus steel are supposed to be equallish, if I remember correctly, and neither work. Only things above that are voidshard and addy. This world has no voidwalkers, so that's out, and I'm not sure if that would be effective either. The iovium working is odd; I suppose the game considers it technically 'better' than D. Steel. Unfortunately it's probably impossible to cut something made of d. steel in half with an iovium axe even at legendary.
The beast bone's no good either, since bolts won't sever anything, and you can't make bone javelins (at least, I don't think so). Even if you could, I suspect the results would be similar to the iovium.
So, yeah - this thing is overpowered on a fort-decimating level, and is definitely the strongest enemy I've ever seen in DF that wasn't deliberately designed to be unkillable (like a slade colossus).
Excuse me while I savescum and hope my artifact door distracts it long enough to drop the roof on it; I doubt anything else will kill it.